火-储耦合系统深度调峰综合经济性分析  

Comprehensive economic analysis of deep peak shaving in thermal power-heat storage coupling systems

作　　者：张成凤 朱轶林 胡东子 富征阳 徐玉杰[2] 沈国清[1] 王亮[2] 陈海生[2] ZHANG Chengfeng;ZHU Yilin;HU Dongzi;FU Zhengyang;XU Yujie;SHEN Guoqing;WANG Liang;CHEN Haisheng(School of Energy Power and Mechanical Engineering,North China Electric Power University,Beijing 102206,China;Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China;School of Energy Power and Mechanical Engineering,North China Electric Power University,Baoding 071003,Hebei,China)

机构地区：[1]华北电力大学能源动力与机械工程学院,北京102206 [2]中国科学院工程热物理研究所,北京100190 [3]华北电力大学能源动力与机械工程学院,河北保定071003

出　　处：《储能科学与技术》2024年第10期3693-3705,共13页Energy Storage Science and Technology

基　　金：国家重点研发计划项目(2022YFB2405200);北京市自然科学基金(3244047)。

摘　　要：火电机组耦合储热技术,可提高机组的热电解耦能力,减少深度调峰对系统安全性和经济性的影响。本工作提出了火电机组与填充床储热的耦合系统,在考虑了机组变工况、填充床储/释热过程动态时间序列基础上,通过EBSILON建立了耦合系统变工况仿真模型;分析深度调峰对耦合系统热力性和碳排放量的影响,通过汽水分离器筒体应力变化分析深调对锅炉寿命损耗的影响,通过转子寿命损耗率曲线分析深调对汽轮机寿命的影响,最终建立耦合系统调度运行经济性模型,开展综合经济性分析。结果表明:火-储耦合系统比自身变工况减小碳排放量7418 t/a(仅配置风电)~9216 t/a(仅配置光伏);深度调峰对锅炉寿命损耗的影响大于汽轮机,火-储耦合系统可提高系统运行寿命,深度调峰318次/年,相比于机组自身变工况(30%~20%额定负荷)可提高13.3%~15.3%;火-储耦合系统深度调峰收益高于火电机组自身变工况,当填充床释热量用于发电或供热时,耦合系统比自身变工况收益分别增加40万元/年、72万元/年。The integration of thermal power plants with heat storage technology can enhance the decoupling capability of the units,thereby reducing the impact of deep peak shaving on the safety and economic viability of the system.This study proposes a coupled system comprising thermal power plants and packed-bed heat storage.Considering the dynamic time series of unit variable operating conditions and packed-bed heat storage/release processes,a simulation model of the coupling system under variable operating conditions was established using Ebsilon.We analyzed the impact of deep peak shaving on the thermal dynamics and carbon emissions of the coupling system.The effect of deep peak shaving on the boiler's life loss rate was investigated by calculating the stress variation of the steam-water separator cylinder.The impact of deep peak shaving on turbine consumption was also examined by analyzing the rotor life loss rate curve.Consequently,an efficient model for the scheduling operation of the coupling system was established to conduct a comprehensive economic analysis.The results show that when the boiler operating status and system power generation remain constant and the power supply structure comprises a renewable energy and energy storage ratio of 5∶1,the coupling system reduces carbon emissions by 7418 t/a(with only wind power)to 9216 t/a(with only photovoltaics)compared with self-variable conditions.The impact of deep peak shaving on the boiler lifespan loss is greater than that on the turbine;however,the coupling system can improve the system lifespan.With deep peak shaving occurring 318 times/a,it can increase by 13.3%—15.3%compared to the unit's self-variable conditions(30%—20%rated load).The economic benefits of deep peak shaving in the coupling system are greater than those of the thermal power plant's self-variable conditions.When the heat released by the packed bed is used for power generation or heating,the benefits of the coupling system increase by 400000 and 720000 RMB/year,respectively,compared to its

关 键 词：火电机组 储热 深度调峰 综合经济性 系统寿命 碳排放 

分 类 号：TK02[动力工程及工程热物理]